Vertebrates and Invertebrates

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Across
  1. 2. The young form of some insects (before becoming adults).
  2. 5. An animal without a backbone.
  3. 6. Organs fish use to breathe underwater.
  4. 8. An animal with a backbone.
  5. 10. Lives in water as young and on land as an adult (e.g., frog).
  6. 12. Big change in form during an animal’s life (e.g., caterpillar → butterfly).
  7. 15. Hard outer shell that protects some animals (e.g., insects).
  8. 16. Lives in water and breathes with gills.
  9. 19. Invertebrate group that includes snails and octopus.
Down
  1. 1. Another name for the spine.
  2. 3. Six-legged arthropod, often with wings.
  3. 4. Internal skeleton (our bones).
  4. 7. Animal with feathers and wings.
  5. 9. What birds have for flight and warmth.
  6. 11. Invertebrate group with jointed legs and an exoskeleton (e.g., spider).
  7. 13. Small plates that cover some animals (fish, reptiles).
  8. 14. Cold-blooded animal that usually has scales.
  9. 15. Many animals lay these to reproduce.
  10. 17. Warm-blooded animal that usually has fur and feeds milk to babies.
  11. 18. Hair on many mammals.